Trignomertic analysis of this function revisited

[gary36]

Just revisiting the thread https://www.edaboard.com/threads/analog-realization-of-trignometric-function.388024/.
Wanted practical help as how sine wave can be approximated with the transfer function sin phi= (1+A)*phi/1+A*phi as posted in the thread. Any clues?

 

[FvM]

Apparently missing brackets in the expression, please correct. I presume the divisor is a variable not 1

 

[gary36]

Yes , corrected equation is sin phi= ((1+A)*phi)/(1+A*phi)